This Realtek RTL8139A Ethernet network card is a great addition to any computer system. With its wired connection, it provides a reliable and stable Internet connection for all your online needs. The card is compatible with a PCI port and has one port available. The card is made by Realtek, a trusted brand in the computer industry. It is an external interface card that can easily be installed into a computer. This network card is perfect for anyone who needs an additional Ethernet port on their computer or wants to upgrade their current network card.